Номер 1289

1) 3m + 2m = 5m

2) 9a – a = 8a

3) 5b + b = 6b

4) 9y + y – 7y = 3y

5) –2b – 7b = –9b

6) 2y + 2y = 4y

7) –4a + a = –3a

8) 7m – 6m – m = 0